Method of decorating glassware.



UNITED STATES PATENT OFFICE.

HUGO THUEMLER, OF SEWIOKLEY, PENNSYLVANIA.

METHOD OF DECORATING GLASSWARE.

SPECIFICATION forming part Of Letters Patent NO. 628,131, dated July 4, 1899.

Application filed February 11, 1399. $erial No, 705,321. (No specimens.)

To all whom it may concern.-

Be it known that I, HUGO THUEMLER, of Sewickley, in the county of Allegheny and State of Pennsylvania,have invented a new and useful Improvement in Methods of Decorating Glassware, of which the following is a full, clear, and exact description.

My invention relates to an improvement in decorating glassware; and it consists in painting or printing decorations in light and dark shades or in different colors and firing or fixing the same in the manner hereinafter described.

Dark-colors applied to transparent glass require a light or White opaque background to cause the design of the dark color to show clearly and distinctly on the glass. Hereto fore this has been done by means of enamel, which requires a separate firing and is more expensive than the method of decorating with fluxes and colors.

In practice it has been found impossible to successfully print a design in dark colors on a light background by means of fluxes and colors for the reason that the fluxes of the two paints will unite and the color will not burn into the glass and the dark design will be non-permanent, blurred, and indistinct. By my invention I am able with fluxes and colors to fix a design on the glass in dark colors with a white or lighter background.

In the practice of my improved method I paint or print the desired design on the glass in dark colors, using any of the well-known fluxes and colors used for this purpose, an appropriate formula for the paint being of what is known in the market as fluxNo. 1O fifty parts and of turquoise-blue or other color fifty parts, or the blue or other color may be used without the flux. Ithen paint or print over the surface of the glass and over the dark design already painted on the glass a light background, using a mixture having preferably the same quality of flux as that used in painting the darker design, an appropriate formula being flux No. 10 fifty parts and opaque obscuring white fifty parts. The glass article is then placed in a kiln,where it is subjected to heat for a period of about two or more hours, more or less, according to the construction of the kiln and the intensity of the heat. It is then removed from the kiln, and it will be found that the fluxes of the two paints have united. The dark color will have been united or burned into the glass by its own flux or by the fiux taken from the lighter color, and the lighter color will also have been united or burned into the glass at all points not covered by the darker design/thereby leaving the dark design clear and distinct, surrounded by a lighter background.

The advantages of my invention will be apparent to those skilled in the art.

Although I have given certain formulae for the paints, I do not desire to limit myself thereto.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

The method of decorating glassware consist: ing in painting a darker design on the glass,

painting a lighter design over the glass and 1 over the darker design, and then firing the glass in such a manner as to cause both the darker and the lighter design to'unite with the glass, substantially as specified.

In testimony whereof I have hereunto set my hand.

' HUGO THUEMLER.

Witnesses:

GEO. P. MURRAY, JAMES K. BAKEWELL. 

